<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CSS绘制三角形</title>
    <link rel="stylesheet" type="text/css" href="drawATriangle.css">

</head>
<body>
<div class="div1"></div>
<div class="div2"></div>
<div class="div3"></div>
<div class="div4"></div>
<div class="div5"></div>
</body>
</html>